uspace/lib/c/generic/irq.c

   1 /*
   2  * Copyright (c) 2014 Martin Decky
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  *
   9  * - Redistributions of source code must retain the above copyright
  10  *   notice, this list of conditions and the following disclaimer.
  11  * - Redistributions in binary form must reproduce the above copyright
  12  *   notice, this list of conditions and the following disclaimer in the
  13  *   documentation and/or other materials provided with the distribution.
  14  * - The name of the author may not be used to endorse or promote products
  15  *   derived from this software without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27  */
  28
  29 /** @addtogroup libc
  30  * @{
  31  */
  32 /** @file
  33  */
  34
  35 #include <ipc/irq.h>
  36 #include <libc.h>
  37 #include <stdlib.h>
  38 #include <stddef.h>
  39 #include <macros.h>
  40
  41 static irq_cmd_t default_cmds[] = {
  42         {
  43                 .cmd = CMD_ACCEPT
  44         }
  45 };
  46
  47 static const irq_code_t default_ucode = {
  48         0,
  49         NULL,
  50         ARRAY_SIZE(default_cmds),
  51         default_cmds
  52 };
  53
  54 /** Subscribe to IRQ notification.
  55  *
  56  * @param inr    IRQ number.
  57  * @param method Use this method for notifying me.
  58  * @param ucode  Top-half pseudocode handler.
  59  *
  60  * @param[out] out_handle  IRQ capability handle returned by the kernel.
  61  *
  62  * @return Error code returned by the kernel.
  63  *
  64  */
  65 int ipc_irq_subscribe(int inr, sysarg_t method, const irq_code_t *ucode,
  66     cap_handle_t *out_handle)
  67 {
  68         if (ucode == NULL)
  69                 ucode = &default_ucode;
  70
  71         return __SYSCALL4(SYS_IPC_IRQ_SUBSCRIBE, inr, method, (sysarg_t) ucode,
  72             (sysarg_t) out_handle);
  73 }
  74
  75 /** Unsubscribe from IRQ notification.
  76  *
  77  * @param cap   IRQ capability handle.
  78  *
  79  * @return Value returned by the kernel.
  80  *
  81  */
  82 int ipc_irq_unsubscribe(cap_handle_t cap)
  83 {
  84         return __SYSCALL1(SYS_IPC_IRQ_UNSUBSCRIBE, cap);
  85 }
  86
  87 /** @}
  88  */